#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>


int main(void)
{
    int fd1, fd2, fd3;
    fd1 = socket(PF_INET,SOCK_STREAM, 0);
    fd2 = open("test.txt", O_CREAT|O_TRUNC);
    fd3 = socket(PF_INET, SOCK_STREAM, 0);

    printf("file descriptor 1: %d\n", fd1);
    printf("file descriptor 2: %d\n", fd2);
    printf("file descriptor 3: %d\n", fd3);

    close(fd1);
    close(fd2);
    close(fd3);

    return 0;
}